Preheat oven to 350°F (175°C).

In a large bowl, cream together the yellow cake mix, softened butter, vanilla extract, and orange juice.

Add the eggs one at a time, beating well after each addition.

Continue beating the mixture for 4 minutes until light and fluffy.

Drain the mandarin oranges thoroughly.

Gently fold the drained mandarin oranges into the cake batter.

Mix only until the oranges are evenly distributed.

Grease and flour a 9 x 13-inch baking pan to prevent sticking.

Pour the cake batter into the prepared pan, spreading it evenly.

Bake in the preheated oven for 30 minutes, or until a wooden skewer inserted into the center comes out clean.

Remove the cake from the oven and let it cool completely in the pan before frosting with Pig Icing (recipe not provided).